I found about this enhancement via Python Insider blog post [1] that also asked adding comments to this issue. Here are mine:
1) Great to see that this is finally done!
2) Is only Python installation directory added into PATH? Why not also Scripts directory under it as originally requested in this issue? As a developer of a Python based test automation tool, just adding Python into PATH doesn't help us because our tool's launcher scripts still aren't found unless PATH is manually edited.
3) I would also prefer this to be on by default.
[1] http://blog.python.org/2012/05/recent-windows-changes-in-python-33.html